GenericSource.cpp revision cdc9cf656a8e43875234cb021fffeb4792d7c74e 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17//#define LOG_NDEBUG 0
18#define LOG_TAG "GenericSource"
19
20#include "GenericSource.h"
21
22#include "AnotherPacketSource.h"
23
24#include <media/IMediaHTTPService.h>
25#include <media/stagefright/foundation/ABuffer.h>
26#include <media/stagefright/foundation/ADebug.h>
27#include <media/stagefright/foundation/AMessage.h>
28#include <media/stagefright/DataSource.h>
29#include <media/stagefright/FileSource.h>
30#include <media/stagefright/MediaBuffer.h>
31#include <media/stagefright/MediaDefs.h>
32#include <media/stagefright/MediaExtractor.h>
33#include <media/stagefright/MediaSource.h>
34#include <media/stagefright/MetaData.h>
35#include <media/stagefright/Utils.h>
36#include "../../libstagefright/include/DRMExtractor.h"
37#include "../../libstagefright/include/NuCachedSource2.h"
38#include "../../libstagefright/include/WVMExtractor.h"
39#include "../../libstagefright/include/HTTPBase.h"
40
41namespace android {
42
43static int64_t kLowWaterMarkUs = 2000000ll;  // 2secs
44static int64_t kHighWaterMarkUs = 5000000ll;  // 5secs
45static const ssize_t kLowWaterMarkBytes = 40000;
46static const ssize_t kHighWaterMarkBytes = 200000;
47
48NuPlayer::GenericSource::GenericSource(
49        const sp<AMessage> &notify,
50        bool uidValid,
51        uid_t uid)
52    : Source(notify),
53      mAudioTimeUs(0),
54      mAudioLastDequeueTimeUs(0),
55      mVideoTimeUs(0),
56      mVideoLastDequeueTimeUs(0),
57      mFetchSubtitleDataGeneration(0),
58      mFetchTimedTextDataGeneration(0),
59      mDurationUs(-1ll),
60      mAudioIsVorbis(false),
61      mIsWidevine(false),
62      mIsSecure(false),
63      mIsStreaming(false),
64      mUIDValid(uidValid),
65      mUID(uid),
66      mFd(-1),
67      mDrmManagerClient(NULL),
68      mBitrate(-1ll),
69      mPollBufferingGeneration(0),
70      mPendingReadBufferTypes(0),
71      mBuffering(false),
72      mPrepareBuffering(false),
73      mPrevBufferPercentage(-1) {
74    resetDataSource();
75    DataSource::RegisterDefaultSniffers();
76}
77
78void NuPlayer::GenericSource::resetDataSource() {
79    mHTTPService.clear();
80    mHttpSource.clear();
81    mUri.clear();
82    mUriHeaders.clear();
83    if (mFd >= 0) {
84        close(mFd);
85        mFd = -1;
86    }
87    mOffset = 0;
88    mLength = 0;
89    setDrmPlaybackStatusIfNeeded(Playback::STOP, 0);
90    mDecryptHandle = NULL;
91    mDrmManagerClient = NULL;
92    mStarted = false;
93    mStopRead = true;
94}
95
96status_t NuPlayer::GenericSource::setDataSource(
97        const sp<IMediaHTTPService> &httpService,
98        const char *url,
99        const KeyedVector<String8, String8> *headers) {
100    resetDataSource();
101
102    mHTTPService = httpService;
103    mUri = url;
104
105    if (headers) {
106        mUriHeaders = *headers;
107    }
108
109    // delay data source creation to prepareAsync() to avoid blocking
110    // the calling thread in setDataSource for any significant time.
111    return OK;
112}
113
114status_t NuPlayer::GenericSource::setDataSource(
115        int fd, int64_t offset, int64_t length) {
116    resetDataSource();
117
118    mFd = dup(fd);
119    mOffset = offset;
120    mLength = length;
121
122    // delay data source creation to prepareAsync() to avoid blocking
123    // the calling thread in setDataSource for any significant time.
124    return OK;
125}
126
127status_t NuPlayer::GenericSource::setDataSource(const sp<DataSource>& source) {
128    resetDataSource();
129    mDataSource = source;
130    return OK;
131}
132
133sp<MetaData> NuPlayer::GenericSource::getFileFormatMeta() const {
134    return mFileMeta;
135}
136
137status_t NuPlayer::GenericSource::initFromDataSource() {
138    sp<MediaExtractor> extractor;
139    String8 mimeType;
140    float confidence;
141    sp<AMessage> dummy;
142    bool isWidevineStreaming = false;
143
144    CHECK(mDataSource != NULL);
145
146    if (mIsWidevine) {
147        isWidevineStreaming = SniffWVM(
148                mDataSource, &mimeType, &confidence, &dummy);
149        if (!isWidevineStreaming ||
150                strcasecmp(
151                    mimeType.string(), MEDIA_MIMETYPE_CONTAINER_WVM)) {
152            ALOGE("unsupported widevine mime: %s", mimeType.string());
153            return UNKNOWN_ERROR;
154        }
155    } else if (mIsStreaming) {
156        if (!mDataSource->sniff(&mimeType, &confidence, &dummy)) {
157            return UNKNOWN_ERROR;
158        }
159        isWidevineStreaming = !strcasecmp(
160                mimeType.string(), MEDIA_MIMETYPE_CONTAINER_WVM);
161    }
162
163    if (isWidevineStreaming) {
164        // we don't want cached source for widevine streaming.
165        mCachedSource.clear();
166        mDataSource = mHttpSource;
167        mWVMExtractor = new WVMExtractor(mDataSource);
168        mWVMExtractor->setAdaptiveStreamingMode(true);
169        if (mUIDValid) {
170            mWVMExtractor->setUID(mUID);
171        }
172        extractor = mWVMExtractor;
173    } else {
174        extractor = MediaExtractor::Create(mDataSource,
175                mimeType.isEmpty() ? NULL : mimeType.string());
176    }
177
178    if (extractor == NULL) {
179        return UNKNOWN_ERROR;
180    }
181
182    if (extractor->getDrmFlag()) {
183        checkDrmStatus(mDataSource);
184    }
185
186    mFileMeta = extractor->getMetaData();
187    if (mFileMeta != NULL) {
188        int64_t duration;
189        if (mFileMeta->findInt64(kKeyDuration, &duration)) {
190            mDurationUs = duration;
191        }
192
193        if (!mIsWidevine) {
194            // Check mime to see if we actually have a widevine source.
195            // If the data source is not URL-type (eg. file source), we
196            // won't be able to tell until now.
197            const char *fileMime;
198            if (mFileMeta->findCString(kKeyMIMEType, &fileMime)
199                    && !strncasecmp(fileMime, "video/wvm", 9)) {
200                mIsWidevine = true;
201            }
202        }
203    }
204
205    int32_t totalBitrate = 0;
206
207    size_t numtracks = extractor->countTracks();
208    if (numtracks == 0) {
209        return UNKNOWN_ERROR;
210    }
211
212    for (size_t i = 0; i < numtracks; ++i) {
213        sp<MediaSource> track = extractor->getTrack(i);
214
215        sp<MetaData> meta = extractor->getTrackMetaData(i);
216
217        const char *mime;
218        CHECK(meta->findCString(kKeyMIMEType, &mime));
219
220        // Do the string compare immediately with "mime",
221        // we can't assume "mime" would stay valid after another
222        // extractor operation, some extractors might modify meta
223        // during getTrack() and make it invalid.
224        if (!strncasecmp(mime, "audio/", 6)) {
225            if (mAudioTrack.mSource == NULL) {
226                mAudioTrack.mIndex = i;
227                mAudioTrack.mSource = track;
228                mAudioTrack.mPackets =
229                    new AnotherPacketSource(mAudioTrack.mSource->getFormat());
230
231                if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_VORBIS)) {
232                    mAudioIsVorbis = true;
233                } else {
234                    mAudioIsVorbis = false;
235                }
236            }
237        } else if (!strncasecmp(mime, "video/", 6)) {
238            if (mVideoTrack.mSource == NULL) {
239                mVideoTrack.mIndex = i;
240                mVideoTrack.mSource = track;
241                mVideoTrack.mPackets =
242                    new AnotherPacketSource(mVideoTrack.mSource->getFormat());
243
244                // check if the source requires secure buffers
245                int32_t secure;
246                if (meta->findInt32(kKeyRequiresSecureBuffers, &secure)
247                        && secure) {
248                    mIsSecure = true;
249                    if (mUIDValid) {
250                        extractor->setUID(mUID);
251                    }
252                }
253            }
254        }
255
256        if (track != NULL) {
257            mSources.push(track);
258            int64_t durationUs;
259            if (meta->findInt64(kKeyDuration, &durationUs)) {
260                if (durationUs > mDurationUs) {
261                    mDurationUs = durationUs;
262                }
263            }
264
265            int32_t bitrate;
266            if (totalBitrate >= 0 && meta->findInt32(kKeyBitRate, &bitrate)) {
267                totalBitrate += bitrate;
268            } else {
269                totalBitrate = -1;
270            }
271        }
272    }
273
274    mBitrate = totalBitrate;
275
276    return OK;
277}
278
279status_t NuPlayer::GenericSource::startSources() {
280    // Start the selected A/V tracks now before we start buffering.
281    // Widevine sources might re-initialize crypto when starting, if we delay
282    // this to start(), all data buffered during prepare would be wasted.
283    // (We don't actually start reading until start().)
284    if (mAudioTrack.mSource != NULL && mAudioTrack.mSource->start() != OK) {
285        ALOGE("failed to start audio track!");
286        return UNKNOWN_ERROR;
287    }
288
289    if (mVideoTrack.mSource != NULL && mVideoTrack.mSource->start() != OK) {
290        ALOGE("failed to start video track!");
291        return UNKNOWN_ERROR;
292    }
293
294    return OK;
295}
296
297void NuPlayer::GenericSource::checkDrmStatus(const sp<DataSource>& dataSource) {
298    dataSource->getDrmInfo(mDecryptHandle, &mDrmManagerClient);
299    if (mDecryptHandle != NULL) {
300        CHECK(mDrmManagerClient);
301        if (RightsStatus::RIGHTS_VALID != mDecryptHandle->status) {
302            sp<AMessage> msg = dupNotify();
303            msg->setInt32("what", kWhatDrmNoLicense);
304            msg->post();
305        }
306    }
307}
308
309int64_t NuPlayer::GenericSource::getLastReadPosition() {
310    if (mAudioTrack.mSource != NULL) {
311        return mAudioTimeUs;
312    } else if (mVideoTrack.mSource != NULL) {
313        return mVideoTimeUs;
314    } else {
315        return 0;
316    }
317}
318
319status_t NuPlayer::GenericSource::setBuffers(
320        bool audio, Vector<MediaBuffer *> &buffers) {
321    if (mIsSecure && !audio) {
322        return mVideoTrack.mSource->setBuffers(buffers);
323    }
324    return INVALID_OPERATION;
325}
326
327bool NuPlayer::GenericSource::isStreaming() const {
328    return mIsStreaming;
329}
330
331NuPlayer::GenericSource::~GenericSource() {
332    if (mLooper != NULL) {
333        mLooper->unregisterHandler(id());
334        mLooper->stop();
335    }
336    resetDataSource();
337}
338
339void NuPlayer::GenericSource::prepareAsync() {
340    if (mLooper == NULL) {
341        mLooper = new ALooper;
342        mLooper->setName("generic");
343        mLooper->start();
344
345        mLooper->registerHandler(this);
346    }
347
348    sp<AMessage> msg = new AMessage(kWhatPrepareAsync, this);
349    msg->post();
350}
351
352void NuPlayer::GenericSource::onPrepareAsync() {
353    // delayed data source creation
354    if (mDataSource == NULL) {
355        // set to false first, if the extractor
356        // comes back as secure, set it to true then.
357        mIsSecure = false;
358
359        if (!mUri.empty()) {
360            const char* uri = mUri.c_str();
361            String8 contentType;
362            mIsWidevine = !strncasecmp(uri, "widevine://", 11);
363
364            if (!strncasecmp("http://", uri, 7)
365                    || !strncasecmp("https://", uri, 8)
366                    || mIsWidevine) {
367                mHttpSource = DataSource::CreateMediaHTTP(mHTTPService);
368                if (mHttpSource == NULL) {
369                    ALOGE("Failed to create http source!");
370                    notifyPreparedAndCleanup(UNKNOWN_ERROR);
371                    return;
372                }
373            }
374
375            mDataSource = DataSource::CreateFromURI(
376                   mHTTPService, uri, &mUriHeaders, &contentType,
377                   static_cast<HTTPBase *>(mHttpSource.get()));
378        } else {
379            mIsWidevine = false;
380
381            mDataSource = new FileSource(mFd, mOffset, mLength);
382            mFd = -1;
383        }
384
385        if (mDataSource == NULL) {
386            ALOGE("Failed to create data source!");
387            notifyPreparedAndCleanup(UNKNOWN_ERROR);
388            return;
389        }
390    }
391
392    if (mDataSource->flags() & DataSource::kIsCachingDataSource) {
393        mCachedSource = static_cast<NuCachedSource2 *>(mDataSource.get());
394    }
395
396    // For widevine or other cached streaming cases, we need to wait for
397    // enough buffering before reporting prepared.
398    // Note that even when URL doesn't start with widevine://, mIsWidevine
399    // could still be set to true later, if the streaming or file source
400    // is sniffed to be widevine. We don't want to buffer for file source
401    // in that case, so must check the flag now.
402    mIsStreaming = (mIsWidevine || mCachedSource != NULL);
403
404    // init extractor from data source
405    status_t err = initFromDataSource();
406
407    if (err != OK) {
408        ALOGE("Failed to init from data source!");
409        notifyPreparedAndCleanup(err);
410        return;
411    }
412
413    if (mVideoTrack.mSource != NULL) {
414        sp<MetaData> meta = doGetFormatMeta(false /* audio */);
415        sp<AMessage> msg = new AMessage;
416        err = convertMetaDataToMessage(meta, &msg);
417        if(err != OK) {
418            notifyPreparedAndCleanup(err);
419            return;
420        }
421        notifyVideoSizeChanged(msg);
422    }
423
424    notifyFlagsChanged(
425            (mIsSecure ? FLAG_SECURE : 0)
426            | (mDecryptHandle != NULL ? FLAG_PROTECTED : 0)
427            | FLAG_CAN_PAUSE
428            | FLAG_CAN_SEEK_BACKWARD
429            | FLAG_CAN_SEEK_FORWARD
430            | FLAG_CAN_SEEK);
431
432    if (mIsSecure) {
433        // secure decoders must be instantiated before starting widevine source
434        sp<AMessage> reply = new AMessage(kWhatSecureDecodersInstantiated, this);
435        notifyInstantiateSecureDecoders(reply);
436    } else {
437        finishPrepareAsync();
438    }
439}
440
441void NuPlayer::GenericSource::onSecureDecodersInstantiated(status_t err) {
442    if (err != OK) {
443        ALOGE("Failed to instantiate secure decoders!");
444        notifyPreparedAndCleanup(err);
445        return;
446    }
447    finishPrepareAsync();
448}
449
450void NuPlayer::GenericSource::finishPrepareAsync() {
451    status_t err = startSources();
452    if (err != OK) {
453        ALOGE("Failed to init start data source!");
454        notifyPreparedAndCleanup(err);
455        return;
456    }
457
458    if (mIsStreaming) {
459        mPrepareBuffering = true;
460
461        ensureCacheIsFetching();
462        restartPollBuffering();
463    } else {
464        notifyPrepared();
465    }
466}
467
468void NuPlayer::GenericSource::notifyPreparedAndCleanup(status_t err) {
469    if (err != OK) {
470        {
471            sp<DataSource> dataSource = mDataSource;
472            sp<NuCachedSource2> cachedSource = mCachedSource;
473            sp<DataSource> httpSource = mHttpSource;
474            {
475                Mutex::Autolock _l(mDisconnectLock);
476                mDataSource.clear();
477                mDecryptHandle = NULL;
478                mDrmManagerClient = NULL;
479                mCachedSource.clear();
480                mHttpSource.clear();
481            }
482        }
483        mBitrate = -1;
484
485        cancelPollBuffering();
486    }
487    notifyPrepared(err);
488}
489
490void NuPlayer::GenericSource::start() {
491    ALOGI("start");
492
493    mStopRead = false;
494    if (mAudioTrack.mSource != NULL) {
495        postReadBuffer(MEDIA_TRACK_TYPE_AUDIO);
496    }
497
498    if (mVideoTrack.mSource != NULL) {
499        postReadBuffer(MEDIA_TRACK_TYPE_VIDEO);
500    }
501
502    setDrmPlaybackStatusIfNeeded(Playback::START, getLastReadPosition() / 1000);
503    mStarted = true;
504
505    (new AMessage(kWhatStart, this))->post();
506}
507
508void NuPlayer::GenericSource::stop() {
509    // nothing to do, just account for DRM playback status
510    setDrmPlaybackStatusIfNeeded(Playback::STOP, 0);
511    mStarted = false;
512    if (mIsWidevine || mIsSecure) {
513        // For widevine or secure sources we need to prevent any further reads.
514        sp<AMessage> msg = new AMessage(kWhatStopWidevine, this);
515        sp<AMessage> response;
516        (void) msg->postAndAwaitResponse(&response);
517    }
518}
519
520void NuPlayer::GenericSource::pause() {
521    // nothing to do, just account for DRM playback status
522    setDrmPlaybackStatusIfNeeded(Playback::PAUSE, 0);
523    mStarted = false;
524}
525
526void NuPlayer::GenericSource::resume() {
527    // nothing to do, just account for DRM playback status
528    setDrmPlaybackStatusIfNeeded(Playback::START, getLastReadPosition() / 1000);
529    mStarted = true;
530
531    (new AMessage(kWhatResume, this))->post();
532}
533
534void NuPlayer::GenericSource::disconnect() {
535    sp<DataSource> dataSource, httpSource;
536    {
537        Mutex::Autolock _l(mDisconnectLock);
538        dataSource = mDataSource;
539        httpSource = mHttpSource;
540    }
541
542    if (dataSource != NULL) {
543        // disconnect data source
544        if (dataSource->flags() & DataSource::kIsCachingDataSource) {
545            static_cast<NuCachedSource2 *>(dataSource.get())->disconnect();
546        }
547    } else if (httpSource != NULL) {
548        static_cast<HTTPBase *>(httpSource.get())->disconnect();
549    }
550}
551
552void NuPlayer::GenericSource::setDrmPlaybackStatusIfNeeded(int playbackStatus, int64_t position) {
553    if (mDecryptHandle != NULL) {
554        mDrmManagerClient->setPlaybackStatus(mDecryptHandle, playbackStatus, position);
555    }
556    mSubtitleTrack.mPackets = new AnotherPacketSource(NULL);
557    mTimedTextTrack.mPackets = new AnotherPacketSource(NULL);
558}
559
560status_t NuPlayer::GenericSource::feedMoreTSData() {
561    return OK;
562}
563
564void NuPlayer::GenericSource::schedulePollBuffering() {
565    sp<AMessage> msg = new AMessage(kWhatPollBuffering, this);
566    msg->setInt32("generation", mPollBufferingGeneration);
567    msg->post(1000000ll);
568}
569
570void NuPlayer::GenericSource::cancelPollBuffering() {
571    mBuffering = false;
572    ++mPollBufferingGeneration;
573    mPrevBufferPercentage = -1;
574}
575
576void NuPlayer::GenericSource::restartPollBuffering() {
577    if (mIsStreaming) {
578        cancelPollBuffering();
579        onPollBuffering();
580    }
581}
582
583void NuPlayer::GenericSource::notifyBufferingUpdate(int32_t percentage) {
584    // Buffering percent could go backward as it's estimated from remaining
585    // data and last access time. This could cause the buffering position
586    // drawn on media control to jitter slightly. Remember previously reported
587    // percentage and don't allow it to go backward.
588    if (percentage < mPrevBufferPercentage) {
589        percentage = mPrevBufferPercentage;
590    } else if (percentage > 100) {
591        percentage = 100;
592    }
593
594    mPrevBufferPercentage = percentage;
595
596    ALOGV("notifyBufferingUpdate: buffering %d%%", percentage);
597
598    sp<AMessage> msg = dupNotify();
599    msg->setInt32("what", kWhatBufferingUpdate);
600    msg->setInt32("percentage", percentage);
601    msg->post();
602}
603
604void NuPlayer::GenericSource::startBufferingIfNecessary() {
605    ALOGV("startBufferingIfNecessary: mPrepareBuffering=%d, mBuffering=%d",
606            mPrepareBuffering, mBuffering);
607
608    if (mPrepareBuffering) {
609        return;
610    }
611
612    if (!mBuffering) {
613        mBuffering = true;
614
615        ensureCacheIsFetching();
616        sendCacheStats();
617
618        sp<AMessage> notify = dupNotify();
619        notify->setInt32("what", kWhatPauseOnBufferingStart);
620        notify->post();
621    }
622}
623
624void NuPlayer::GenericSource::stopBufferingIfNecessary() {
625    ALOGV("stopBufferingIfNecessary: mPrepareBuffering=%d, mBuffering=%d",
626            mPrepareBuffering, mBuffering);
627
628    if (mPrepareBuffering) {
629        mPrepareBuffering = false;
630        notifyPrepared();
631        return;
632    }
633
634    if (mBuffering) {
635        mBuffering = false;
636
637        sendCacheStats();
638
639        sp<AMessage> notify = dupNotify();
640        notify->setInt32("what", kWhatResumeOnBufferingEnd);
641        notify->post();
642    }
643}
644
645void NuPlayer::GenericSource::sendCacheStats() {
646    int32_t kbps = 0;
647    status_t err = UNKNOWN_ERROR;
648
649    if (mWVMExtractor != NULL) {
650        err = mWVMExtractor->getEstimatedBandwidthKbps(&kbps);
651    } else if (mCachedSource != NULL) {
652        err = mCachedSource->getEstimatedBandwidthKbps(&kbps);
653    }
654
655    if (err == OK) {
656        sp<AMessage> notify = dupNotify();
657        notify->setInt32("what", kWhatCacheStats);
658        notify->setInt32("bandwidth", kbps);
659        notify->post();
660    }
661}
662
663void NuPlayer::GenericSource::ensureCacheIsFetching() {
664    if (mCachedSource != NULL) {
665        mCachedSource->resumeFetchingIfNecessary();
666    }
667}
668
669void NuPlayer::GenericSource::onPollBuffering() {
670    status_t finalStatus = UNKNOWN_ERROR;
671    int64_t cachedDurationUs = -1ll;
672    ssize_t cachedDataRemaining = -1;
673
674    ALOGW_IF(mWVMExtractor != NULL && mCachedSource != NULL,
675            "WVMExtractor and NuCachedSource both present");
676
677    if (mWVMExtractor != NULL) {
678        cachedDurationUs =
679                mWVMExtractor->getCachedDurationUs(&finalStatus);
680    } else if (mCachedSource != NULL) {
681        cachedDataRemaining =
682                mCachedSource->approxDataRemaining(&finalStatus);
683
684        if (finalStatus == OK) {
685            off64_t size;
686            int64_t bitrate = 0ll;
687            if (mDurationUs > 0 && mCachedSource->getSize(&size) == OK) {
688                bitrate = size * 8000000ll / mDurationUs;
689            } else if (mBitrate > 0) {
690                bitrate = mBitrate;
691            }
692            if (bitrate > 0) {
693                cachedDurationUs = cachedDataRemaining * 8000000ll / bitrate;
694            }
695        }
696    }
697
698    if (finalStatus != OK) {
699        ALOGV("onPollBuffering: EOS (finalStatus = %d)", finalStatus);
700
701        if (finalStatus == ERROR_END_OF_STREAM) {
702            notifyBufferingUpdate(100);
703        }
704
705        stopBufferingIfNecessary();
706        return;
707    } else if (cachedDurationUs >= 0ll) {
708        if (mDurationUs > 0ll) {
709            int64_t cachedPosUs = getLastReadPosition() + cachedDurationUs;
710            int percentage = 100.0 * cachedPosUs / mDurationUs;
711            if (percentage > 100) {
712                percentage = 100;
713            }
714
715            notifyBufferingUpdate(percentage);
716        }
717
718        ALOGV("onPollBuffering: cachedDurationUs %.1f sec",
719                cachedDurationUs / 1000000.0f);
720
721        if (cachedDurationUs < kLowWaterMarkUs) {
722            startBufferingIfNecessary();
723        } else if (cachedDurationUs > kHighWaterMarkUs) {
724            stopBufferingIfNecessary();
725        }
726    } else if (cachedDataRemaining >= 0) {
727        ALOGV("onPollBuffering: cachedDataRemaining %zd bytes",
728                cachedDataRemaining);
729
730        if (cachedDataRemaining < kLowWaterMarkBytes) {
731            startBufferingIfNecessary();
732        } else if (cachedDataRemaining > kHighWaterMarkBytes) {
733            stopBufferingIfNecessary();
734        }
735    }
736
737    schedulePollBuffering();
738}
739
740void NuPlayer::GenericSource::onMessageReceived(const sp<AMessage> &msg) {
741    switch (msg->what()) {
742      case kWhatPrepareAsync:
743      {
744          onPrepareAsync();
745          break;
746      }
747      case kWhatFetchSubtitleData:
748      {
749          fetchTextData(kWhatSendSubtitleData, MEDIA_TRACK_TYPE_SUBTITLE,
750                  mFetchSubtitleDataGeneration, mSubtitleTrack.mPackets, msg);
751          break;
752      }
753
754      case kWhatFetchTimedTextData:
755      {
756          fetchTextData(kWhatSendTimedTextData, MEDIA_TRACK_TYPE_TIMEDTEXT,
757                  mFetchTimedTextDataGeneration, mTimedTextTrack.mPackets, msg);
758          break;
759      }
760
761      case kWhatSendSubtitleData:
762      {
763          sendTextData(kWhatSubtitleData, MEDIA_TRACK_TYPE_SUBTITLE,
764                  mFetchSubtitleDataGeneration, mSubtitleTrack.mPackets, msg);
765          break;
766      }
767
768      case kWhatSendTimedTextData:
769      {
770          sendTextData(kWhatTimedTextData, MEDIA_TRACK_TYPE_TIMEDTEXT,
771                  mFetchTimedTextDataGeneration, mTimedTextTrack.mPackets, msg);
772          break;
773      }
774
775      case kWhatChangeAVSource:
776      {
777          int32_t trackIndex;
778          CHECK(msg->findInt32("trackIndex", &trackIndex));
779          const sp<MediaSource> source = mSources.itemAt(trackIndex);
780
781          Track* track;
782          const char *mime;
783          media_track_type trackType, counterpartType;
784          sp<MetaData> meta = source->getFormat();
785          meta->findCString(kKeyMIMEType, &mime);
786          if (!strncasecmp(mime, "audio/", 6)) {
787              track = &mAudioTrack;
788              trackType = MEDIA_TRACK_TYPE_AUDIO;
789              counterpartType = MEDIA_TRACK_TYPE_VIDEO;;
790          } else {
791              CHECK(!strncasecmp(mime, "video/", 6));
792              track = &mVideoTrack;
793              trackType = MEDIA_TRACK_TYPE_VIDEO;
794              counterpartType = MEDIA_TRACK_TYPE_AUDIO;;
795          }
796
797
798          if (track->mSource != NULL) {
799              track->mSource->stop();
800          }
801          track->mSource = source;
802          track->mSource->start();
803          track->mIndex = trackIndex;
804
805          int64_t timeUs, actualTimeUs;
806          const bool formatChange = true;
807          if (trackType == MEDIA_TRACK_TYPE_AUDIO) {
808              timeUs = mAudioLastDequeueTimeUs;
809          } else {
810              timeUs = mVideoLastDequeueTimeUs;
811          }
812          readBuffer(trackType, timeUs, &actualTimeUs, formatChange);
813          readBuffer(counterpartType, -1, NULL, formatChange);
814          ALOGV("timeUs %lld actualTimeUs %lld", (long long)timeUs, (long long)actualTimeUs);
815
816          break;
817      }
818
819      case kWhatStart:
820      case kWhatResume:
821      {
822          restartPollBuffering();
823          break;
824      }
825
826      case kWhatPollBuffering:
827      {
828          int32_t generation;
829          CHECK(msg->findInt32("generation", &generation));
830          if (generation == mPollBufferingGeneration) {
831              onPollBuffering();
832          }
833          break;
834      }
835
836      case kWhatGetFormat:
837      {
838          onGetFormatMeta(msg);
839          break;
840      }
841
842      case kWhatGetSelectedTrack:
843      {
844          onGetSelectedTrack(msg);
845          break;
846      }
847
848      case kWhatSelectTrack:
849      {
850          onSelectTrack(msg);
851          break;
852      }
853
854      case kWhatSeek:
855      {
856          onSeek(msg);
857          break;
858      }
859
860      case kWhatReadBuffer:
861      {
862          onReadBuffer(msg);
863          break;
864      }
865
866      case kWhatSecureDecodersInstantiated:
867      {
868          int32_t err;
869          CHECK(msg->findInt32("err", &err));
870          onSecureDecodersInstantiated(err);
871          break;
872      }
873
874      case kWhatStopWidevine:
875      {
876          // mStopRead is only used for Widevine to prevent the video source
877          // from being read while the associated video decoder is shutting down.
878          mStopRead = true;
879          if (mVideoTrack.mSource != NULL) {
880              mVideoTrack.mPackets->clear();
881          }
882          sp<AMessage> response = new AMessage;
883          sp<AReplyToken> replyID;
884          CHECK(msg->senderAwaitsResponse(&replyID));
885          response->postReply(replyID);
886          break;
887      }
888      default:
889          Source::onMessageReceived(msg);
890          break;
891    }
892}
893
894void NuPlayer::GenericSource::fetchTextData(
895        uint32_t sendWhat,
896        media_track_type type,
897        int32_t curGen,
898        sp<AnotherPacketSource> packets,
899        sp<AMessage> msg) {
900    int32_t msgGeneration;
901    CHECK(msg->findInt32("generation", &msgGeneration));
902    if (msgGeneration != curGen) {
903        // stale
904        return;
905    }
906
907    int32_t avail;
908    if (packets->hasBufferAvailable(&avail)) {
909        return;
910    }
911
912    int64_t timeUs;
913    CHECK(msg->findInt64("timeUs", &timeUs));
914
915    int64_t subTimeUs;
916    readBuffer(type, timeUs, &subTimeUs);
917
918    int64_t delayUs = subTimeUs - timeUs;
919    if (msg->what() == kWhatFetchSubtitleData) {
920        const int64_t oneSecUs = 1000000ll;
921        delayUs -= oneSecUs;
922    }
923    sp<AMessage> msg2 = new AMessage(sendWhat, this);
924    msg2->setInt32("generation", msgGeneration);
925    msg2->post(delayUs < 0 ? 0 : delayUs);
926}
927
928void NuPlayer::GenericSource::sendTextData(
929        uint32_t what,
930        media_track_type type,
931        int32_t curGen,
932        sp<AnotherPacketSource> packets,
933        sp<AMessage> msg) {
934    int32_t msgGeneration;
935    CHECK(msg->findInt32("generation", &msgGeneration));
936    if (msgGeneration != curGen) {
937        // stale
938        return;
939    }
940
941    int64_t subTimeUs;
942    if (packets->nextBufferTime(&subTimeUs) != OK) {
943        return;
944    }
945
946    int64_t nextSubTimeUs;
947    readBuffer(type, -1, &nextSubTimeUs);
948
949    sp<ABuffer> buffer;
950    status_t dequeueStatus = packets->dequeueAccessUnit(&buffer);
951    if (dequeueStatus == OK) {
952        sp<AMessage> notify = dupNotify();
953        notify->setInt32("what", what);
954        notify->setBuffer("buffer", buffer);
955        notify->post();
956
957        const int64_t delayUs = nextSubTimeUs - subTimeUs;
958        msg->post(delayUs < 0 ? 0 : delayUs);
959    }
960}
961
962sp<MetaData> NuPlayer::GenericSource::getFormatMeta(bool audio) {
963    sp<AMessage> msg = new AMessage(kWhatGetFormat, this);
964    msg->setInt32("audio", audio);
965
966    sp<AMessage> response;
967    void *format;
968    status_t err = msg->postAndAwaitResponse(&response);
969    if (err == OK && response != NULL) {
970        CHECK(response->findPointer("format", &format));
971        return (MetaData *)format;
972    } else {
973        return NULL;
974    }
975}
976
977void NuPlayer::GenericSource::onGetFormatMeta(sp<AMessage> msg) const {
978    int32_t audio;
979    CHECK(msg->findInt32("audio", &audio));
980
981    sp<AMessage> response = new AMessage;
982    sp<MetaData> format = doGetFormatMeta(audio);
983    response->setPointer("format", format.get());
984
985    sp<AReplyToken> replyID;
986    CHECK(msg->senderAwaitsResponse(&replyID));
987    response->postReply(replyID);
988}
989
990sp<MetaData> NuPlayer::GenericSource::doGetFormatMeta(bool audio) const {
991    sp<MediaSource> source = audio ? mAudioTrack.mSource : mVideoTrack.mSource;
992
993    if (source == NULL) {
994        return NULL;
995    }
996
997    return source->getFormat();
998}
999
1000status_t NuPlayer::GenericSource::dequeueAccessUnit(
1001        bool audio, sp<ABuffer> *accessUnit) {
1002    Track *track = audio ? &mAudioTrack : &mVideoTrack;
1003
1004    if (track->mSource == NULL) {
1005        return -EWOULDBLOCK;
1006    }
1007
1008    if (mIsWidevine && !audio) {
1009        // try to read a buffer as we may not have been able to the last time
1010        postReadBuffer(MEDIA_TRACK_TYPE_VIDEO);
1011    }
1012
1013    status_t finalResult;
1014    if (!track->mPackets->hasBufferAvailable(&finalResult)) {
1015        if (finalResult == OK) {
1016            postReadBuffer(
1017                    audio ? MEDIA_TRACK_TYPE_AUDIO : MEDIA_TRACK_TYPE_VIDEO);
1018            return -EWOULDBLOCK;
1019        }
1020        return finalResult;
1021    }
1022
1023    status_t result = track->mPackets->dequeueAccessUnit(accessUnit);
1024
1025    // start pulling in more buffers if we only have one (or no) buffer left
1026    // so that decoder has less chance of being starved
1027    if (track->mPackets->getAvailableBufferCount(&finalResult) < 2) {
1028        postReadBuffer(audio? MEDIA_TRACK_TYPE_AUDIO : MEDIA_TRACK_TYPE_VIDEO);
1029    }
1030
1031    if (result != OK) {
1032        if (mSubtitleTrack.mSource != NULL) {
1033            mSubtitleTrack.mPackets->clear();
1034            mFetchSubtitleDataGeneration++;
1035        }
1036        if (mTimedTextTrack.mSource != NULL) {
1037            mTimedTextTrack.mPackets->clear();
1038            mFetchTimedTextDataGeneration++;
1039        }
1040        return result;
1041    }
1042
1043    int64_t timeUs;
1044    status_t eosResult; // ignored
1045    CHECK((*accessUnit)->meta()->findInt64("timeUs", &timeUs));
1046    if (audio) {
1047        mAudioLastDequeueTimeUs = timeUs;
1048    } else {
1049        mVideoLastDequeueTimeUs = timeUs;
1050    }
1051
1052    if (mSubtitleTrack.mSource != NULL
1053            && !mSubtitleTrack.mPackets->hasBufferAvailable(&eosResult)) {
1054        sp<AMessage> msg = new AMessage(kWhatFetchSubtitleData, this);
1055        msg->setInt64("timeUs", timeUs);
1056        msg->setInt32("generation", mFetchSubtitleDataGeneration);
1057        msg->post();
1058    }
1059
1060    if (mTimedTextTrack.mSource != NULL
1061            && !mTimedTextTrack.mPackets->hasBufferAvailable(&eosResult)) {
1062        sp<AMessage> msg = new AMessage(kWhatFetchTimedTextData, this);
1063        msg->setInt64("timeUs", timeUs);
1064        msg->setInt32("generation", mFetchTimedTextDataGeneration);
1065        msg->post();
1066    }
1067
1068    return result;
1069}
1070
1071status_t NuPlayer::GenericSource::getDuration(int64_t *durationUs) {
1072    *durationUs = mDurationUs;
1073    return OK;
1074}
1075
1076size_t NuPlayer::GenericSource::getTrackCount() const {
1077    return mSources.size();
1078}
1079
1080sp<AMessage> NuPlayer::GenericSource::getTrackInfo(size_t trackIndex) const {
1081    size_t trackCount = mSources.size();
1082    if (trackIndex >= trackCount) {
1083        return NULL;
1084    }
1085
1086    sp<AMessage> format = new AMessage();
1087    sp<MetaData> meta = mSources.itemAt(trackIndex)->getFormat();
1088
1089    const char *mime;
1090    CHECK(meta->findCString(kKeyMIMEType, &mime));
1091    format->setString("mime", mime);
1092
1093    int32_t trackType;
1094    if (!strncasecmp(mime, "video/", 6)) {
1095        trackType = MEDIA_TRACK_TYPE_VIDEO;
1096    } else if (!strncasecmp(mime, "audio/", 6)) {
1097        trackType = MEDIA_TRACK_TYPE_AUDIO;
1098    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_TEXT_3GPP)) {
1099        trackType = MEDIA_TRACK_TYPE_TIMEDTEXT;
1100    } else {
1101        trackType = MEDIA_TRACK_TYPE_UNKNOWN;
1102    }
1103    format->setInt32("type", trackType);
1104
1105    const char *lang;
1106    if (!meta->findCString(kKeyMediaLanguage, &lang)) {
1107        lang = "und";
1108    }
1109    format->setString("language", lang);
1110
1111    if (trackType == MEDIA_TRACK_TYPE_SUBTITLE) {
1112        int32_t isAutoselect = 1, isDefault = 0, isForced = 0;
1113        meta->findInt32(kKeyTrackIsAutoselect, &isAutoselect);
1114        meta->findInt32(kKeyTrackIsDefault, &isDefault);
1115        meta->findInt32(kKeyTrackIsForced, &isForced);
1116
1117        format->setInt32("auto", !!isAutoselect);
1118        format->setInt32("default", !!isDefault);
1119        format->setInt32("forced", !!isForced);
1120    }
1121
1122    return format;
1123}
1124
1125ssize_t NuPlayer::GenericSource::getSelectedTrack(media_track_type type) const {
1126    sp<AMessage> msg = new AMessage(kWhatGetSelectedTrack, this);
1127    msg->setInt32("type", type);
1128
1129    sp<AMessage> response;
1130    int32_t index;
1131    status_t err = msg->postAndAwaitResponse(&response);
1132    if (err == OK && response != NULL) {
1133        CHECK(response->findInt32("index", &index));
1134        return index;
1135    } else {
1136        return -1;
1137    }
1138}
1139
1140void NuPlayer::GenericSource::onGetSelectedTrack(sp<AMessage> msg) const {
1141    int32_t tmpType;
1142    CHECK(msg->findInt32("type", &tmpType));
1143    media_track_type type = (media_track_type)tmpType;
1144
1145    sp<AMessage> response = new AMessage;
1146    ssize_t index = doGetSelectedTrack(type);
1147    response->setInt32("index", index);
1148
1149    sp<AReplyToken> replyID;
1150    CHECK(msg->senderAwaitsResponse(&replyID));
1151    response->postReply(replyID);
1152}
1153
1154ssize_t NuPlayer::GenericSource::doGetSelectedTrack(media_track_type type) const {
1155    const Track *track = NULL;
1156    switch (type) {
1157    case MEDIA_TRACK_TYPE_VIDEO:
1158        track = &mVideoTrack;
1159        break;
1160    case MEDIA_TRACK_TYPE_AUDIO:
1161        track = &mAudioTrack;
1162        break;
1163    case MEDIA_TRACK_TYPE_TIMEDTEXT:
1164        track = &mTimedTextTrack;
1165        break;
1166    case MEDIA_TRACK_TYPE_SUBTITLE:
1167        track = &mSubtitleTrack;
1168        break;
1169    default:
1170        break;
1171    }
1172
1173    if (track != NULL && track->mSource != NULL) {
1174        return track->mIndex;
1175    }
1176
1177    return -1;
1178}
1179
1180status_t NuPlayer::GenericSource::selectTrack(size_t trackIndex, bool select, int64_t timeUs) {
1181    ALOGV("%s track: %zu", select ? "select" : "deselect", trackIndex);
1182    sp<AMessage> msg = new AMessage(kWhatSelectTrack, this);
1183    msg->setInt32("trackIndex", trackIndex);
1184    msg->setInt32("select", select);
1185    msg->setInt64("timeUs", timeUs);
1186
1187    sp<AMessage> response;
1188    status_t err = msg->postAndAwaitResponse(&response);
1189    if (err == OK && response != NULL) {
1190        CHECK(response->findInt32("err", &err));
1191    }
1192
1193    return err;
1194}
1195
1196void NuPlayer::GenericSource::onSelectTrack(sp<AMessage> msg) {
1197    int32_t trackIndex, select;
1198    int64_t timeUs;
1199    CHECK(msg->findInt32("trackIndex", &trackIndex));
1200    CHECK(msg->findInt32("select", &select));
1201    CHECK(msg->findInt64("timeUs", &timeUs));
1202
1203    sp<AMessage> response = new AMessage;
1204    status_t err = doSelectTrack(trackIndex, select, timeUs);
1205    response->setInt32("err", err);
1206
1207    sp<AReplyToken> replyID;
1208    CHECK(msg->senderAwaitsResponse(&replyID));
1209    response->postReply(replyID);
1210}
1211
1212status_t NuPlayer::GenericSource::doSelectTrack(size_t trackIndex, bool select, int64_t timeUs) {
1213    if (trackIndex >= mSources.size()) {
1214        return BAD_INDEX;
1215    }
1216
1217    if (!select) {
1218        Track* track = NULL;
1219        if (mSubtitleTrack.mSource != NULL && trackIndex == mSubtitleTrack.mIndex) {
1220            track = &mSubtitleTrack;
1221            mFetchSubtitleDataGeneration++;
1222        } else if (mTimedTextTrack.mSource != NULL && trackIndex == mTimedTextTrack.mIndex) {
1223            track = &mTimedTextTrack;
1224            mFetchTimedTextDataGeneration++;
1225        }
1226        if (track == NULL) {
1227            return INVALID_OPERATION;
1228        }
1229        track->mSource->stop();
1230        track->mSource = NULL;
1231        track->mPackets->clear();
1232        return OK;
1233    }
1234
1235    const sp<MediaSource> source = mSources.itemAt(trackIndex);
1236    sp<MetaData> meta = source->getFormat();
1237    const char *mime;
1238    CHECK(meta->findCString(kKeyMIMEType, &mime));
1239    if (!strncasecmp(mime, "text/", 5)) {
1240        bool isSubtitle = strcasecmp(mime, MEDIA_MIMETYPE_TEXT_3GPP);
1241        Track *track = isSubtitle ? &mSubtitleTrack : &mTimedTextTrack;
1242        if (track->mSource != NULL && track->mIndex == trackIndex) {
1243            return OK;
1244        }
1245        track->mIndex = trackIndex;
1246        if (track->mSource != NULL) {
1247            track->mSource->stop();
1248        }
1249        track->mSource = mSources.itemAt(trackIndex);
1250        track->mSource->start();
1251        if (track->mPackets == NULL) {
1252            track->mPackets = new AnotherPacketSource(track->mSource->getFormat());
1253        } else {
1254            track->mPackets->clear();
1255            track->mPackets->setFormat(track->mSource->getFormat());
1256
1257        }
1258
1259        if (isSubtitle) {
1260            mFetchSubtitleDataGeneration++;
1261        } else {
1262            mFetchTimedTextDataGeneration++;
1263        }
1264
1265        status_t eosResult; // ignored
1266        if (mSubtitleTrack.mSource != NULL
1267                && !mSubtitleTrack.mPackets->hasBufferAvailable(&eosResult)) {
1268            sp<AMessage> msg = new AMessage(kWhatFetchSubtitleData, this);
1269            msg->setInt64("timeUs", timeUs);
1270            msg->setInt32("generation", mFetchSubtitleDataGeneration);
1271            msg->post();
1272        }
1273
1274        if (mTimedTextTrack.mSource != NULL
1275                && !mTimedTextTrack.mPackets->hasBufferAvailable(&eosResult)) {
1276            sp<AMessage> msg = new AMessage(kWhatFetchTimedTextData, this);
1277            msg->setInt64("timeUs", timeUs);
1278            msg->setInt32("generation", mFetchTimedTextDataGeneration);
1279            msg->post();
1280        }
1281
1282        return OK;
1283    } else if (!strncasecmp(mime, "audio/", 6) || !strncasecmp(mime, "video/", 6)) {
1284        bool audio = !strncasecmp(mime, "audio/", 6);
1285        Track *track = audio ? &mAudioTrack : &mVideoTrack;
1286        if (track->mSource != NULL && track->mIndex == trackIndex) {
1287            return OK;
1288        }
1289
1290        sp<AMessage> msg = new AMessage(kWhatChangeAVSource, this);
1291        msg->setInt32("trackIndex", trackIndex);
1292        msg->post();
1293        return OK;
1294    }
1295
1296    return INVALID_OPERATION;
1297}
1298
1299status_t NuPlayer::GenericSource::seekTo(int64_t seekTimeUs) {
1300    sp<AMessage> msg = new AMessage(kWhatSeek, this);
1301    msg->setInt64("seekTimeUs", seekTimeUs);
1302
1303    sp<AMessage> response;
1304    status_t err = msg->postAndAwaitResponse(&response);
1305    if (err == OK && response != NULL) {
1306        CHECK(response->findInt32("err", &err));
1307    }
1308
1309    return err;
1310}
1311
1312void NuPlayer::GenericSource::onSeek(sp<AMessage> msg) {
1313    int64_t seekTimeUs;
1314    CHECK(msg->findInt64("seekTimeUs", &seekTimeUs));
1315
1316    sp<AMessage> response = new AMessage;
1317    status_t err = doSeek(seekTimeUs);
1318    response->setInt32("err", err);
1319
1320    sp<AReplyToken> replyID;
1321    CHECK(msg->senderAwaitsResponse(&replyID));
1322    response->postReply(replyID);
1323}
1324
1325status_t NuPlayer::GenericSource::doSeek(int64_t seekTimeUs) {
1326    // If the Widevine source is stopped, do not attempt to read any
1327    // more buffers.
1328    if (mStopRead) {
1329        return INVALID_OPERATION;
1330    }
1331    if (mVideoTrack.mSource != NULL) {
1332        int64_t actualTimeUs;
1333        readBuffer(MEDIA_TRACK_TYPE_VIDEO, seekTimeUs, &actualTimeUs);
1334
1335        seekTimeUs = actualTimeUs;
1336        mVideoLastDequeueTimeUs = seekTimeUs;
1337    }
1338
1339    if (mAudioTrack.mSource != NULL) {
1340        readBuffer(MEDIA_TRACK_TYPE_AUDIO, seekTimeUs);
1341        mAudioLastDequeueTimeUs = seekTimeUs;
1342    }
1343
1344    setDrmPlaybackStatusIfNeeded(Playback::START, seekTimeUs / 1000);
1345    if (!mStarted) {
1346        setDrmPlaybackStatusIfNeeded(Playback::PAUSE, 0);
1347    }
1348
1349    // If currently buffering, post kWhatBufferingEnd first, so that
1350    // NuPlayer resumes. Otherwise, if cache hits high watermark
1351    // before new polling happens, no one will resume the playback.
1352    stopBufferingIfNecessary();
1353    restartPollBuffering();
1354
1355    return OK;
1356}
1357
1358sp<ABuffer> NuPlayer::GenericSource::mediaBufferToABuffer(
1359        MediaBuffer* mb,
1360        media_track_type trackType,
1361        int64_t /* seekTimeUs */,
1362        int64_t *actualTimeUs) {
1363    bool audio = trackType == MEDIA_TRACK_TYPE_AUDIO;
1364    size_t outLength = mb->range_length();
1365
1366    if (audio && mAudioIsVorbis) {
1367        outLength += sizeof(int32_t);
1368    }
1369
1370    sp<ABuffer> ab;
1371    if (mIsSecure && !audio) {
1372        // data is already provided in the buffer
1373        ab = new ABuffer(NULL, mb->range_length());
1374        mb->add_ref();
1375        ab->setMediaBufferBase(mb);
1376    } else {
1377        ab = new ABuffer(outLength);
1378        memcpy(ab->data(),
1379               (const uint8_t *)mb->data() + mb->range_offset(),
1380               mb->range_length());
1381    }
1382
1383    if (audio && mAudioIsVorbis) {
1384        int32_t numPageSamples;
1385        if (!mb->meta_data()->findInt32(kKeyValidSamples, &numPageSamples)) {
1386            numPageSamples = -1;
1387        }
1388
1389        uint8_t* abEnd = ab->data() + mb->range_length();
1390        memcpy(abEnd, &numPageSamples, sizeof(numPageSamples));
1391    }
1392
1393    sp<AMessage> meta = ab->meta();
1394
1395    int64_t timeUs;
1396    CHECK(mb->meta_data()->findInt64(kKeyTime, &timeUs));
1397    meta->setInt64("timeUs", timeUs);
1398
1399#if 0
1400    // Temporarily disable pre-roll till we have a full solution to handle
1401    // both single seek and continous seek gracefully.
1402    if (seekTimeUs > timeUs) {
1403        sp<AMessage> extra = new AMessage;
1404        extra->setInt64("resume-at-mediaTimeUs", seekTimeUs);
1405        meta->setMessage("extra", extra);
1406    }
1407#endif
1408
1409    if (trackType == MEDIA_TRACK_TYPE_TIMEDTEXT) {
1410        const char *mime;
1411        CHECK(mTimedTextTrack.mSource != NULL
1412                && mTimedTextTrack.mSource->getFormat()->findCString(kKeyMIMEType, &mime));
1413        meta->setString("mime", mime);
1414    }
1415
1416    int64_t durationUs;
1417    if (mb->meta_data()->findInt64(kKeyDuration, &durationUs)) {
1418        meta->setInt64("durationUs", durationUs);
1419    }
1420
1421    if (trackType == MEDIA_TRACK_TYPE_SUBTITLE) {
1422        meta->setInt32("trackIndex", mSubtitleTrack.mIndex);
1423    }
1424
1425    uint32_t dataType; // unused
1426    const void *seiData;
1427    size_t seiLength;
1428    if (mb->meta_data()->findData(kKeySEI, &dataType, &seiData, &seiLength)) {
1429        sp<ABuffer> sei = ABuffer::CreateAsCopy(seiData, seiLength);;
1430        meta->setBuffer("sei", sei);
1431    }
1432
1433    if (actualTimeUs) {
1434        *actualTimeUs = timeUs;
1435    }
1436
1437    mb->release();
1438    mb = NULL;
1439
1440    return ab;
1441}
1442
1443void NuPlayer::GenericSource::postReadBuffer(media_track_type trackType) {
1444    Mutex::Autolock _l(mReadBufferLock);
1445
1446    if ((mPendingReadBufferTypes & (1 << trackType)) == 0) {
1447        mPendingReadBufferTypes |= (1 << trackType);
1448        sp<AMessage> msg = new AMessage(kWhatReadBuffer, this);
1449        msg->setInt32("trackType", trackType);
1450        msg->post();
1451    }
1452}
1453
1454void NuPlayer::GenericSource::onReadBuffer(sp<AMessage> msg) {
1455    int32_t tmpType;
1456    CHECK(msg->findInt32("trackType", &tmpType));
1457    media_track_type trackType = (media_track_type)tmpType;
1458    readBuffer(trackType);
1459    {
1460        // only protect the variable change, as readBuffer may
1461        // take considerable time.
1462        Mutex::Autolock _l(mReadBufferLock);
1463        mPendingReadBufferTypes &= ~(1 << trackType);
1464    }
1465}
1466
1467void NuPlayer::GenericSource::readBuffer(
1468        media_track_type trackType, int64_t seekTimeUs, int64_t *actualTimeUs, bool formatChange) {
1469    // Do not read data if Widevine source is stopped
1470    if (mStopRead) {
1471        return;
1472    }
1473    Track *track;
1474    size_t maxBuffers = 1;
1475    switch (trackType) {
1476        case MEDIA_TRACK_TYPE_VIDEO:
1477            track = &mVideoTrack;
1478            if (mIsWidevine) {
1479                maxBuffers = 2;
1480            } else {
1481                maxBuffers = 4;
1482            }
1483            break;
1484        case MEDIA_TRACK_TYPE_AUDIO:
1485            track = &mAudioTrack;
1486            if (mIsWidevine) {
1487                maxBuffers = 8;
1488            } else {
1489                maxBuffers = 64;
1490            }
1491            break;
1492        case MEDIA_TRACK_TYPE_SUBTITLE:
1493            track = &mSubtitleTrack;
1494            break;
1495        case MEDIA_TRACK_TYPE_TIMEDTEXT:
1496            track = &mTimedTextTrack;
1497            break;
1498        default:
1499            TRESPASS();
1500    }
1501
1502    if (track->mSource == NULL) {
1503        return;
1504    }
1505
1506    if (actualTimeUs) {
1507        *actualTimeUs = seekTimeUs;
1508    }
1509
1510    MediaSource::ReadOptions options;
1511
1512    bool seeking = false;
1513
1514    if (seekTimeUs >= 0) {
1515        options.setSeekTo(seekTimeUs, MediaSource::ReadOptions::SEEK_PREVIOUS_SYNC);
1516        seeking = true;
1517    }
1518
1519    if (mIsWidevine) {
1520        options.setNonBlocking();
1521    }
1522
1523    for (size_t numBuffers = 0; numBuffers < maxBuffers; ) {
1524        MediaBuffer *mbuf;
1525        status_t err = track->mSource->read(&mbuf, &options);
1526
1527        options.clearSeekTo();
1528
1529        if (err == OK) {
1530            int64_t timeUs;
1531            CHECK(mbuf->meta_data()->findInt64(kKeyTime, &timeUs));
1532            if (trackType == MEDIA_TRACK_TYPE_AUDIO) {
1533                mAudioTimeUs = timeUs;
1534            } else if (trackType == MEDIA_TRACK_TYPE_VIDEO) {
1535                mVideoTimeUs = timeUs;
1536            }
1537
1538            queueDiscontinuityIfNeeded(seeking, formatChange, trackType, track);
1539
1540            sp<ABuffer> buffer = mediaBufferToABuffer(
1541                    mbuf, trackType, seekTimeUs, actualTimeUs);
1542            track->mPackets->queueAccessUnit(buffer);
1543            formatChange = false;
1544            seeking = false;
1545            ++numBuffers;
1546        } else if (err == WOULD_BLOCK) {
1547            break;
1548        } else if (err == INFO_FORMAT_CHANGED) {
1549#if 0
1550            track->mPackets->queueDiscontinuity(
1551                    ATSParser::DISCONTINUITY_FORMATCHANGE,
1552                    NULL,
1553                    false /* discard */);
1554#endif
1555        } else {
1556            queueDiscontinuityIfNeeded(seeking, formatChange, trackType, track);
1557            track->mPackets->signalEOS(err);
1558            break;
1559        }
1560    }
1561}
1562
1563void NuPlayer::GenericSource::queueDiscontinuityIfNeeded(
1564        bool seeking, bool formatChange, media_track_type trackType, Track *track) {
1565    // formatChange && seeking: track whose source is changed during selection
1566    // formatChange && !seeking: track whose source is not changed during selection
1567    // !formatChange: normal seek
1568    if ((seeking || formatChange)
1569            && (trackType == MEDIA_TRACK_TYPE_AUDIO
1570            || trackType == MEDIA_TRACK_TYPE_VIDEO)) {
1571        ATSParser::DiscontinuityType type = (formatChange && seeking)
1572                ? ATSParser::DISCONTINUITY_FORMATCHANGE
1573                : ATSParser::DISCONTINUITY_NONE;
1574        track->mPackets->queueDiscontinuity(type, NULL /* extra */, true /* discard */);
1575    }
1576}
1577
1578}  // namespace android
1579